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Weld Morphology and Corrosion Characteristics of Flux-Assisted Gas Tungsten Arc-Welded Super Duplex Stainless Steel

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Abstract

The strength of a weld joint can be improved by increasing the depth of penetration (DOP) in flux-assisted gas tungsten arc welding (A-GTAW). However, the corrosion resistance gets reduced which restricts the service life of components after A-GTAW. The objective of the present study is to examine the corrosion resistance of super duplex stainless steel plates made by A-GTAW using multiple fluxes, such as SiO2, TiO2, MoO3, MoS2, NiO and ZnO. Welds with adequate DOP were considered for subsequent microstructural and corrosion characterization. It was observed that the weld microstructures had predominantly δ-ferrite phase along with austenite (γ) phase. The pitting corrosion behavior of the welds was analyzed using electrochemical potentiodynamic polarization and immersion corrosion tests. The results were further confirmed through electrochemical impedance spectroscopy and capacitance tests. The corrosion products formed after electrochemical tests consisted of α-FeO(OH) and γ-Fe2O3. Secondary particles from the fluxes were observed to be dominated over the austenite (γ) phase which reduced the overall corrosion resistance of the welds. Among the fluxes considered in the present study, TiO2 flux provided decent DOP with the best corrosion resistance of the weld.

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Acknowledgment

The author acknowledges the Department of Metallurgical and Material Engineering, VSSUT, Burla, for helping to carry out the experimental works. The authors also acknowledge the help received from the XRD-texture laboratory of Metallurgical and Materials Engineering, NIT, Rourkela.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, Veer Surendra Sai University of Technology, Burla, Sambalpur, 768018, India

    Nilakantha Sahu & Sushant Kumar Badjena

  2. Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur, India

    Rosan Kumar Naik

  3. Department of Metallurgical and Materials Engineering, National Institute of Technology, Rourkela, India

    Deepankar Panda & Santosh Kumar Sahoo

  4. Department of Chemistry, Veer Surendra Sai University of Technology, Sambalpur, India

    Pravin Kumar Kar

  5. Department of Metallurgical and Materials Engineering, Malaviya National Institute of Technology, Jaipur, India

    Deepankar Panda

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Sahu, N., Naik, R.K., Panda, D. et al. Weld Morphology and Corrosion Characteristics of Flux-Assisted Gas Tungsten Arc-Welded Super Duplex Stainless Steel. J. of Materi Eng and Perform (2024). https://doi.org/10.1007/s11665-024-09582-5

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